The outflow structure of GW170817 from late-time broad-band observations

By E. Troja, L. Piro, G. Ryan, H. V. Eerten, R. Ricci, M. Wieringa, S. Lotti, T. Sakamoto, S. Cenko. 2018

212 citations recorded by the source corpus.

We present our broad-band study of GW170817 from radio to hard X-rays, including NuSTAR and Chandra observations up to 165  d after the merger, and a multimessenger analysis including LIGO constraints. The data are compared with predictions from a wide range of models, providing the first detailed comparison between non-trivial cocoon and jet models. Homogeneous and power-law shaped jets, as well as simple cocoon models are ruled out by the data, while both a Gaussian shaped jet and a cocoon with energy injection can describe the current data set for a reasonable range of physical parameters, consistent with the typical values derived from short GRB afterglows. We propose that these models can be unambiguously discriminated by future observations measuring the post-peak behaviour, with F_ν ∝ t^(∼−1.0) for the cocoon and F_ν∝ t^(∼−2.5) for the jet model.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/bf6e6162f03c059ff0b537bf35c6027bb138c1e9

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Bing Zhang
2. B. Metzger
3. E. Berger
4. W. Fong
5. E. Quataert
6. W. N. Brandt
7. P. Hopkins
8. Raffaella Margutti

In Nuclear and High Energy Physics

1. E. Berger
2. B. Metzger
3. L. Sironi
4. Bing Zhang
5. D. Giannios
6. G. Ghirlanda
7. S. Gezari
8. W. N. Brandt

Citations in the corpus

• Rates of compact object coalescences (2021, background): “However, the evidence from GW170817 firmly indicated that the jet has spatial structure, rather than a simple tophat profile (Troja et al., 2018; Resmi et al., 2018; Lamb et al., 2019).”
• The Zwicky Transient Facility: Science Objectives (2019, background): “…(e.g., Lamb & Kobayashi 2018; Granot et al. 2017; Lazzati et al. 2018; Gill & Granot 2018; Nakar & Piran 2018) especially the wide-angle mildly relativistic cocoon breakout seen in GW170817 (Hallinan et al. 2017; Mooley et al. 2018; Dobie et al. 2018; Alexander et al. 2018; Troja et al. 2018).”
• Gamma-Ray Burst Afterglows in the Multimessenger Era: Numerical Models and Closure Relations (2019, methodology): “We assume i q= obs and use the posterior probability distribution ip cosLIGO ( ) reported in Abbott et al. (2017c; assuming Planck H0, their Figure 3) as a prior for qobs as in Troja et al. (2018a).”
• A Decline in the X-Ray through Radio Emission from GW170817 Continues to Support an Off-axis Structured Jet (2018, background): “…first ∼160 days, with a single spectral power law, fν∝ν β with β≈−0.6, spanning ∼109–1018 Hz (Alexander et al. 2017; Hallinan et al. 2017; Kim et al. 2017; D’Avanzo et al. 2018; Margutti et al. 2018; Mooley et al. 2018b; Pooley et al. 2018; Resmi et al. 2018; Ruan et al. 2018; Troja et al. 2018).”
• The evolution of the X-ray afterglow emission of GW 170817 / GRB 170817A in XMM-Newton observations (2018, methodology): “7−0.8), with negligible spectral evolution over a broadband spectrum (Fν ∝ ν−0.6; Mooley et al. 2018; Margutti et al. 2018; Ruan et al. 2018; Troja et al. 2018a).”
• The Karl G. Jansky Very Large Array Sky Survey (VLASS). Science Case and Survey Design (2019, background): “…emission consistent with a wide-angle outflow of mildly relativistic material (Kasliwal et al. 2017; Mooley et al. 2018b; Margutti et al. 2018; Hotokezaka et al. 2018; Troja et al. 2018), and late-time emission dominated by a narrow energetic jet (Mooley et al. 2018c,d; Ghirlanda et al. 2018).”